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Water-Year Summary for Site 05550000

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  • Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
  • For water years 2014 onward, choose a water year and parameter and an on-demand Water-Year Summary report will be generated.
  • For water years 2006 through 2013, choose a water year and an Annual Water Data Report will be provided.
  • For water years 2005 and earlier, Annual Water Data Reports may be available in digital format.
  • Not all sites have reports available for every water year.
Available Parameters
00065 Gage height(Mean)  

Water year 2023: 2022-10-01 to 2023-09-30

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USGS Water-Year Summary 2023
LOCATION - Lat 42°09'58.7", long 88°17'25.2" referenced to North American Datum of 1983, in SW 1/4 NE 1/4 NW 1/4 sec.34, T.43 N., R.8 E., McHenry County, IL, Hydrologic Unit 07120006, on right bank 20 ft upstream from bridge on State Highway 62 (Algonquin Road) in Algonquin, 140 ft upstream from Algonquin Dam, and at mile 81.6.
DRAINAGE AREA - 1,403 mi².
REVISIONS HISTORY - WSP 1175: 1916. WDR IL-75-1: Drainage area.
  DISCHARGE: October 1915 to September 2009.
    Monthly discharge only for some periods, published in WSP 1308.
  STAGE: Water years 1994 to current.
  ALGAE: Water years 1989-90.
GAGE - Water-stage recorder, satellite telemeter, and concrete dam with adjustable gate. Datum of gage is 729.21 ft above NAVD of 1988. Prior to Oct. 20, 1933, non-recording gage at site 20 ft downstream at same datum.
REMARKS - Stage regulated by Stratton Lock and Dam (previously known as McHenry Dam).
EXTREMES FOR PERIOD OF RECORD - SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 6,720 ft³/s, May 22, 2004 and Aug. 25, 2007, gage heights 3.09 ft and 3.50 ft respectively, due to regulation; maximum gage height, 4.50 ft, April 1, 1916; from graph based on gage readings; Minimum discharge, no flow, Nov. 26, 1952, Nov. 20, 1953, Oct. 25, 1956 and Sept. 9, 14, 1958, result of windstorm.